Lifting jack



Feb. 1o, 1925. A'1,526,156

.|.R. KINNEY LIFTIvNG JACK lFled March 10. 1924 Figi.

l 1L@ Q10, l 11 4 ji' @1 1.@

Patented Feb. l, 1925.

PATENT G'FFICE.

JUSTUS It. KINNEY,` 0F JAMAIUA. PLAIN, MASSACHUSETTS.

LIFTING LTACK. t

Application filed March 10, 1924. `Serial` No. 698,022.

This invention relatesto liftingjacks and has for its object the production of a device of this character which will be particularly adaptedfor use in connection with motor vehicles equippedfwith balloon tires.

' i i The inventionl consists primarily of a base having a post; extending upwardly therefrom at an angle tothe 4botto-m ofthe base `and adapted to move into a perpendicular position as the load-supporting member on said post is moved upwardly thereon. t

The invention consists further in,` means whereby the actuating nut on saidpost may be `rotated about said post when desired without affecting the movement of the loadsup porting member.

The invention consists further in means whereby the load-supporting member is prevented from rotating about the axisof said post.

The invention consists further of certain novel features of construction and arrange ment of parts which will be understood readily by reference to the description lof the drawings and to the claims to be hereinafter given. Y t p For the .purpose` of illustrating the invention, onepreferred formthereof is illustrated inV the drawings, this form having been found to give satisfactory and reliable results although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized and the invention is notlimited to the 4precise arrangement and organization of these instrumentalities as herein shown and Vdescribed except as required by the scope of the appended claims.

Ofthe drawings: Figure 1 represents a vertical section of a lifting jack embodying the principles of the present invention. f Figure 2 `represents a horizontal section `of sameon line 2, 2, on Fig. 1.

Figure 3 represents a horizontal section of same on line, 3, on Fig. 1.

same on line 5, 57 on Fi 4. j

.Similar characters indicate like parts ings.

In the drawings 10 is a base plate having secured tothe upper face thereof a block 11 having a `socket 12 therein, said socket being provided with an inclined wall 13 and an oppositely disposed perpendicular wall 14.

The block 11 has a transverse pin 15 extending across the socket 12, this pin 15 extendingthrougha hole'16 in the lower end of theY threaded post 17, said hole 16 having a diameter slightly greater than that of the pin 15.`

.Normally the post 17' rests against the inclined wall 13 thereby assuming an inclined position` as indicated in dotted lines at 18 in Fig. 1.

The post 17 has a groove 19 extending throughout the several figures of the draw-- "lengthwise thereof into which extends the .key 20 in theguide block 21.

This guide block 21 has flat sides `which contact with the inner faces of the side togethervby rivets 24 and the axle A rests upon the upper edge 25 thereof and against .the vertical edge 26 of the carriage'22. A

The ends of the plate forming the carriage .22 are divi-ded and the upper portions 27 thereof are secured` together by rivetsV 28 Ywhile the lower portions 29 overlap and are secured together by rivets 30, these rivets -also securing to the carriage 22 an arm'Bl extending downwardly and provided with a finger 82 extending toward the post 17.

The guide block 21 is provided with oppositely disposed trunnions 33` positioned in` cylindrical openings in the side walls of the carriage 22 and in which they' are adapted to oscillate.

Asimilar guide block 34: is inounted'in the same manner at the upper end of the carriage 22 but this block is not provided with a key 2O as is the case with the block 2l.

.the grooveV 19.

The guide block 21 extends slightly below the lower edge of the carriage 22 and rests upon the nut which is threaded to the post 17.

By rotating this nut 35 the carriage 22 may be moved lengthwise loff `the post 17.

Any means may be employed to impart rotation to the nut but preferably said nut has formed integraltherewith a bevel gear 36 the teeth of which mesh 'with'the teeth of a pinion 37 iixedly. secured to an actuatingshaft 38 having bearings in the arm Bland the overlapped ends 29 of the plate forming the load-supporting member 22 23.

flhe linger 82extendsvheneaththe gear 364v and isspaced therefrom a sufficient distance to permit Vthe load-supporting member 22; 23 being lifted manually until the pinion-,37 is disengaged from gear 36.

Then thi's'has been done thenut 35 may be rotated manually until it is approximately inthe position where theextension 23 will engage theload to be lifted.

lVhen thus adjusted the-loadsupporting member 22, 23' is'permitted to againI rest upon the nut, the extension-23 is linserted beneath `the axleA., and the .latter` is'lifte'd by rotating the actuating` shaft`38 in any well known manner. y

While the nut 35 is rfree `to rotate uponthe post 17 theload-supporting member22, 23 is prevented from rotation by the keyv 20,in

It hasbeen found' that best results arcobtained in lifting a load by having the post 17, at the start, in theposition indicated bythe dotted lines18, that is inclined from a perpendicularl away fiomthe load A with the lower end of post 17 resting against the inclinedwall 13.

As the load A is lifted the weight thereof will gradually move the post 17 about its pivot 15 fromfits inclined position 18 until it, reaches a. ierpendicular position with its lower end caring against the vertical wall 14.

This makes a. very eifective .lifting jack particularly adapted for usein connection ywith motor vehicles and is reasily operated as the two guide blocks 21, 34e prevent any cramping lupon the post 17 while the load A is being lifted. y

It is very durable and constructed at little cost. l

It is believed that the operation and many advantages ofthe invention will be fully apparent without further description.

Having thus described my invention, I claim- 1. .In a device of theeclass described, a threaded post; a base having a socket in which the lower end of said post is pivotally mounted, said socket having one inclined wall and an oppositely disposed perpendicular wall; and a load-supporting member movable lengthwise of said post.

2. In' 'a device of the class described, a threaded post having a groove extending lengthwise thereof; a base therefor; a loadsupporting member on vsaid post; a guide member surrounding said post with trun- -nionsin bearings in said load-supporting member; a key in said guide member extending into said groove; and means for moving said load-supporting member lengthwise of said post.

3. In a device of theclass described, a threaded post having a groove extending lengthwise thereof; a base therefor; a loadsupporting member on said post; two'guide members surrounding said post with trunnions in bearings'` in saidl load-supporting member; a key in one guide member extending into said groove; and means for moving said load-supporting member lengthn'fise of said post.k

4. In a -device of the class-described, a threaded post; a base. therefor; a load-supporting Amember movable'lengthwise of said post; a revolublejnut threaded tosaid post vand upon which said'member-normall y rest-s; and means whereby the load-supporting member maybe raisedfrom said-.nut to 'apermit thezlatter to be -manually adjusted-on said post.

5. lnia device of the class described, a threaded'vpost; a base therefor; a load-supporting member movable lengthwise of said post; a :revoluble nut threaded to said post and yupon which saidmember normally rests, saidnut having Ebevel. gear teeth on its'periphery; a pinion carried by said load-supporting member coacting with said bevel gear teeth; means for rotating said pinion; and means whereby said load-supporting member. maybe lifted sutliciently to disen- `gage saidV pinion and gear teeth.

6. InA a device of the class described, a threaded post; a base therefor.; a load-supporting member movable lengthwise of said post; a revoluble nut threaded to said post and upon which said member normally rests,

said nut having bevel gear teeth Yon its periphery; a pinion carried by saidiload-supporting member coacting .with said bevel gear teeth; means. for rotatingsaid pinion; and an arm secured to said load-supporting member having a finger extending beneath said` nut and spaced therefrom suiiiciently to permit the pinion to be disengaged from said gear teeth.

7. In aI device of the class described, a threaded post; a base plate;y a block secured thereto and having a socket in which the lower end of said post is pivotally.mounted, said socket having one inclined'wall and an oppositely disposed perpendicular wall; and a load supporting member movable lengthwise of said post.

8. In adevice of the class described, a lozid-supporting member llengthwise of said threaded post having a. groove extending post. lengthwise thereof; a. base therefor; e. load Signed by me at 746 Old South Bldg., supporting member on said post consisting Bos-ton, Massachusetts, this 8th day of u of a. bent plate the ends of which tre secured March, 1924.

together; a. guide member surrounding said post With trunnons in bearings in the side JUSTUS R' KINNEY Walls of `said load-supporting member; a Witnesses: key in said guide member extending into WALTER E. LOMBARD,

i0 said groove; and means for moving said NATHAN C. LOMBARD. 

